Processing of multi-carrier phase-modulated signals of a heterodyne interference detecting system

A heterodyne interference detecting system for long distance security pre-warning are introduced. Analyzed the generation principles of the multi-carrier phase-modulated signals, according to the purpose of signal processing, realized the intrusion event judgment and positioning by means of power spectrum analysis, extracted the modulated signals caused by the intrusion event by means of phase-lock-loop technique. Several factors maybe affecting system performance are analyzed and corresponding solutions are proposed.